Finding the Right Pet-Sitting or Grooming Company?

It sounds like the groomer in Japan went above and beyond the call of duty when grooming your dog, Shih-tzufan !
I have most done my own grooming with my little Chipper; but as he has gotten older, he seems to have a harder time being bathed and clipped. I usually now only clip him in the early summer , so he will be more comfortable in the hot weather. Even though we have air-conditioning, and I always put a special little fan on the floor for Chipper and Tootsie; he still gets too hot with his long Yorkie-style coat when the weather is hot and humid.
I only have small clippers, because I don't need to use them often; so I have been thinking that it might just be easier on Chipper if I take him to a professional groomer who has a good set of clippers and is an expert with the clipping.
He would probably not like having a stranger clipping him; however, the ordeal would be over much faster if I did this, so in the end, he might like that part better.
The worrisome part is the challenge of finding a good groomer to do the job and also be gentle with Chipper, who is eleven years old now, and a lot more delicate than he used to be.

I am still trying to decide which is the best way to go with this; but so far the weather has been wet and cool; so he is not suffering with the heat.